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I think deleting the corrupted autosave file should help (or starting a new game to overwrite it):

C:\Users\*username*\AppData\LocalLow\Glitch Pitch\Idol Manager\data\auto_save.json

It probably breaks the save/load popup so your manual saves don't show up

I followed your address and the autosave file I got was empty, checked manual saves and there was nothing after Nov 30 (started a new game for update 12.1 in December.). Tried a quick autosave but those files are still gone.